okay, im not an exert or anything but..here's somethings i researched.
first, it would not be wise to go under 1200 (just so you know)
of my knowledge, to lose about a lb a day, you may need to cut out 300-500 calories from the amount of calories you need to maintain your weight.
..hope this helps.
you can email me if you want. thanks
smcsushiapple@yahoo.com